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#include "pinchwidget.h"

#include <QPainter>
#include <QImage>
#include <QPixmap>
#include <QPanGesture>
#include <QPinchGesture>
#include <QPushButton>

PinchWidget::PinchWidget(const QImage &image, QWidget *parent)
    : QWidget(parent)
{
    setMinimumSize(100,100);
    this->image = image;
    pan = new QPanGesture(this);
    connect(pan, SIGNAL(triggered()), this, SLOT(onPanTriggered()));
    connect(pan, SIGNAL(finished()), this, SLOT(onPanFinished()));
    pinch = new QPinchGesture(this);
    connect(pinch, SIGNAL(triggered()), this, SLOT(onPinchTriggered()));
    connect(pinch, SIGNAL(finished()), this, SLOT(onPinchFinished()));
}

QSize PinchWidget::sizeHint() const
{
    return image.size()*1.5;
}

void PinchWidget::paintEvent(QPaintEvent *)
{
    QPainter p(this);
    QTransform t = worldTransform * currentPanTransform * currentPinchTransform;
    p.setTransform(t);
    QPoint center = QPoint(width()/2, height()/2);
    QPoint size = QPoint(image.width()/2, image.height()/2);
    p.translate(center - size);
    p.drawImage(QPoint(0,0), image);
}

void PinchWidget::acceptTouchEvents()
{
    setAttribute(Qt::WA_AcceptTouchEvents);
    if (QWidget *w = qobject_cast<QPushButton*>(sender()))
        w->setEnabled(false);
}

void PinchWidget::onPanTriggered()
{
    currentPanTransform = QTransform()
        .translate(pan->totalOffset().width(),
                   pan->totalOffset().height());
    update();
}

void PinchWidget::onPanFinished()
{
    worldTransform *= currentPanTransform;
    currentPanTransform.reset();
    update();
}

void PinchWidget::onPinchTriggered()
{
    QPoint transformCenter = worldTransform.map(QPoint(width()/2, height()/2));
    currentPinchTransform = QTransform()
        .translate(transformCenter.x(), transformCenter.y())
        .scale(pinch->totalScaleFactor(), pinch->totalScaleFactor())
        .rotate(pinch->totalRotationAngle())
        .translate(-transformCenter.x(), -transformCenter.y());
    update();
}

void PinchWidget::onPinchFinished()
{
    worldTransform *= currentPinchTransform;
    currentPinchTransform.reset();
    update();
}